tzselect: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/tzselect - from package: glibc-common

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/tzselect - from package: libc-bin

You may install the required package with command apt-get install {package}

Error in other languages:
tzselect: bevel nie gevind nie
tzselect: comandă negăsită
tzselect: comando não encontrado
tzselect: commande introuvable
tzselect: command not found
tzselect: käsku ei ole
tzselect: không tìm thấy lệnh
tzselect: komanda nerasta
tzselect: Kommando nicht gefunden.
tzselect: kommandot finns inte
tzselect: komut yok
tzselect: nie znaleziono polecenia
tzselect: níor aimsíodh an t-ordú
tzselect: no se encontró la orden
tzselect: no s'ha trobat l'ordre
tzselect: opdracht niet gevonden
tzselect: parancs nem található
tzselect: perintah tidak ditemukan
tzselect: príkaz nenájdený
tzselect: příkaz nenalezen
tzselect: команда не найдена
tzselect: командата не е открита
tzselect: 命令找不到
tzselect: コマンドが見つかりません